Sorry – I'm not going to be able to help. These userobject messages are complex undocumented things, and may be different in format for each parameter, so cannot easily be explained. They are designed to be used either by sequencers, or for one 4000 to control another one.
Later products, like the H8000, have a different format that is more understandable, but the 4000 has the limitations described above.
